Rotatable tree shear device

ABSTRACT

A tree shear device adapted to attach to the frame of a vehicle is disclosed. The shear includes a shear frame, an anvil member, a shear blade pivotally mounted on and carried by the anvil member to form a tree-cutting portion in association with the anvil member, a controlled rotatable drive mounted on the shear frame and attached to the tree-cutting portion for supporting it and for rotating it to a desired angle, and a device attached between the shear blade and the anvil for for causing the blade to pivot relative to the anvil to cut a tree positioned therebetween. Since the tree-cutting portion can be rotated and since the edge of the blade is specifically designed to cause the tree being cut to always fall to one side, as respects the blade and anvil, the tree being cut may be caused to fall to one side or the other by rotating the tree-cutting portion through an angle of 180*.

United States Patent [72] Inventor Kenneth J. Ramey P.0. Box 146, TwoHarbors, Minn. 556116 [21] Appl. No. 885,742 [22] Filed Dec. 17, 1969I45] Putentcd Dec. 14. 1971 [54] ROTATABLE TREE SHEAR DEVICE ll Claims,6 Drawing Figs.

FOREIGN PATENTS 908,763 10/1945 France Primary Examiner-Gerald A. DostAllorney-Wicks & Nemer ABSTRACT: A tree shear device adapted to attachto the frame of a vehicle is disclosed. The shear includes a shearframe, an anvil member, a shear blade pivotally mounted on and carriedby the anvil member to form a tree-cutting portion in association withthe anvil member, a controlled rotatable drive mounted on the shearframe and attached to the treecutting portion for supporting it and forrotating it to a desired angle, and a device attached between the shearblade and the anvil for for causing the blade to pivot relative to theanvil to cut a tree positioned therebetween. Since the tree-cuttingportion can be rotated and since the edge of the blade is specificailydesigned to cause the tree being cut to always fall to one side, asrespects the blade and anvil, the tree being cut may be caused to fallto one side or the other by rotating the treecutting portion through anangle of 180! SUMMARY OF THE INVENTION This invention relates totree-cutting apparatus, more partieularly to tree-cutting apparatusadapted to attach to the frame of a mobile vehicle, and moreparticularly still to a tree shear deviee adapted to attach to the frameof a mobile vehicle. In the harvesting of tress it is frequentlydesirable to fell a tree in a certain direction due to terrain, othertress, etc. It is an object of the invention to provide a tree shearwhich will shear a standing tree so that it will fall either to theright or the left of the vehicle on which the tree shear is mounted.

Briefly, a preferred embodiment of the present invention includes ashear frame, an anvil member, a shear blade pivotally mounted on andcarried by the anvil member to form a tree cutter in association withthe anvil member, and a controlled rotatable drive mounted on the shearframe and connected to the tree cutter to support it and to rotate it toa desired cutting angle, when actuated. The controlled rotatable driveincludes a shaft journaled in the shear frame and attached to the treecutter, a pinion gear mounted on the shaft to rotate with it, a rackgear having its teeth engaging the teeth of the pinion gear, and a pairof hydraulic cylinders positioned at opposite ends of the rack gear withthe rack gear extending between the pistons of the hydraulic cylinders.When actuated, the fluid flowing into one hydraulic cylinder and out ofthe other forces the pistons to move transversely, the piston movementcauses corresponding transverse movement of the rack gear, thetransverse movement of the rack gear rotates the pinion gear, androtation of the pinion gear rotates the tree cutter.

The three shear device also includes another hydraulic cylinder devicefor causing the blade to pivot relative to the anvil to cut a treepositioned between the blade and the anvil when fluid pressure isapplied to the piston of this hydraulic device. The angle of the shearblade in the preferred embodiment is ground wedge shaped so that a treeout between the shear blade and the anvil will always fall towards theanvil. This way, if a tree is desired to fall leftward of the vehiclecarrying the tree shear device, the tree cutter is rotated until theanvil is leftward of the shear blade. Conversely, when it. is desiredthat a tree fall rightward of the vehicle carrying the tree sheardevice, the tree cutter is rotated until the anvil is rightward of theshear blade.

The preferred embodiment of the tree shear device of the presentinvention further includes hydraulic cylinders which raise and lower theshear frame relative to the frame of the mobile vehicle for causing theraising and lowering of the tree cutter in order to position itvertically with respect to the tree to be cut. More specifically, alever member extends from the frame to of the mobile vehicle to theshear frame, and the lever is pivotally attached to both the vehicleframe and the shear frame. A first hydraulic cylinder is attachedbetween the vehicle frame and the lever to lift the tree shear deviceinto its proper vertical position, and a second hydraulic cylinder isattached between the lever and the shear frame to properly tilt the treecutter with respect to the tree to be cut.

It is thus an object of he present invention to provide a novel treeshear device.

It is a further object of the present invention to provide a novel treeshear device in which the tree-cutting portion may be rotated to changethe angular positioning of the tree cutting portion with respect to thetree to be cut.

It is a further object of the present invention to provide a noveltree-cutting device in which the tree-cutting portion may be rotatedthrough an angle of at least 180, and in which the tree-cutting portionis arranged to cause the tree to be cut to always fall in apredetermined direction with respect to the cutting portion so that thedirection of fall may be changed by rotating the cutting portion.

It is a further object of the present invention to provide a novel treeshear device which is vertically adjustable to allow the verticalpositioning of a cutting portion with respect to a tree to be cut.

It is a still further object of the present invention to provide a novelhydraulically controlled tree shear.

These and further objects and advantages of the present invention willbecome clear in the light of the following detailed description of anillustrative embodiment of this invention described in conjunction withthe drawings.

DESCRIPTION OF THE DRAWINGS FIG. 11 shows a top plan view of the treeshear device of the present invention connected to the front portion ofa tractor with the cutting portion of the tree shear device shown insolid line in a first position and shown in phantom in a second position180 rotated from the first position.

FIG. 2 shows a side elevational view of the tree shear device of FIG. lwith the tree shear device shown in solid line in a first verticalposition and shown in phantom in other vertical positions.

FIG. 3 shows a front elevational view of the tree shear device of FIG. lwith a tree to be cut shown in phantom positioned within the cuttingportion of the shear device.

FIG. 4 is an enlarged top plan view of a portion of the tree sheardevice of the present invention which controls the rotation of thecutting portion with some internal parts shown in phantom and some partsomitted for clarity.

FIG. 5 is a sectional view taken on the line 5-5 of FIG. 4.

FIG. 6 is a schematic representation of the hydraulic control of thetree shear device of the present invention shown in conjunction with thehydraulic cylinders operated.

Where used in the various figures of the drawings, the same numeralsdesignate the same or similar parts. Furthermore, when the tenns right,"left," front," and back" are used herein it should be understood thatthese terms have reference only to the structure as shown in thedrawings and are utilized only to facilitate describing the invention.

DESCRIPTION In the first three FIGS. of the drawings, a mobile vehicleor tractor is shown and generally designated as 32. Tractor 32 includesfour wheels 34, the front two of which are shown. Tractor 32 alsoincludes a vehicle frame 36 supported by the wheels and in turnsupporting an operators seat 38, actuating means in the form of controlvalves generally designated 40, and a hydraulic fluid reservoir 412 bestseen in FIG. 3.

The tree shear device of the present invention is shown connected totractor frame 36 as follows. A pair of shear frame and lift cylinderhangers M are welded to the tractor frame 36, one on the left side oftractor frame 36 and one on the right side. A transverse shear frame sois then connected to the shear frame hangers $4 by means of a pair oflevers 48, best shown in FIG. 2. The right side lever 413 shown in FIG.2 has a rearward extending end pivotally attached to the shear framehanger M on the right side of tractor frame 36 and has a forwardextending and pivotally attached to the right end of shear frame 46. Anidentical lever member 48 is similarly attached between the shear framehanger M on the left side of tractor frame 36 and the left end of shearframe 46.

Four hydraulic cylinders attached to the tractor frame 36, lever members48, and shear frame 46, allow the raising and lowering of the shearframe as relative to the tractor frame 36. In particular, identicalshear life cylinders 50 are attached leftward and rightward of tractorframe 36 between shear frame hangers M and upward extending ears d7welded to lever members 48. Shear lift cylinders 50 have a first endpivotally attached to bifurcated ears d3 horizontally projecting fromhangers and have a second end pivotally attached to the ears 47 on leverlb by means of a bifurcated end 49 to allow an operator to change theangle between hanger 4d and lever 38 from the angle shown in FIG. 2.Similarly, a pair of shear tilt cylinders 52 are positioned betweenlevers 48 and shear frame 46 with one tilt cylinder positioned on theleft side of tractor frame 36 and one tilt cylinder positioned on theright side. Tilt cylinders 52 have a bifurcated end 53 pivotallyconnected to upstanding ears 5] formed on lever member 48 and haveanother bifurcated end 57 pivotally connected to upstanding ears 53formed on transverse shear frame 46 so as to allow an operator to varythe angular disposition of shear frame 46 relative to lever 48 from thel80 angle shown in FIG. 2.

The tree-cutting means or tree-cutting portion of the tree shear deviceof the present invention is generally designated as 54 and includes ananvil member 56 and a shear blade 58. Shear blade 58 is pivotallymounted on and carried by anvil member 56 by means of a short shaft 60arranged at 90 to the plane of anvil member 56 and joumaled within apair of bosses 62 formed on the upper and lower surfaces of anvil member56. Shear blade 58 has a semicircular, concave outwardly extending,angularly disposed, i.e. wedge-shaped shearing edge 64 which mates witha semicircular concave inwardly extending blade-receiving portion 66 ofanvil member 56. The pivotal motion of shear blade 58 with respect tothe anvil member 56 is caused by hydraulic means 67. Hydraulic means 67includes a hydraulic cylinder 68 which has a first end pivotallyattached to anvil member 56 by means of a shaft 70 journaled withinupper and lower bosses 72 formed on anvil member 56 and passing throughan extension 74 upon the one end of cylinder 68. Cylinder 68 includes ahydraulic piston, not specifically shown, arranged to reciprocally movewithin cylinder 68, and shear blade 58 is attached to the hydraulicpiston through a piston rod 76. Specifically, one end of piston rod 76has a forked extension 78, and shear blade 58 is pivotally connectedbetween the tines of this forked extension by a short shaft 80 which isfixed to the forked extension 78 and is journaled within blade 58 and apair of spacers 82 positioned above and below blade 58. Fluid pressurewithin hydraulic cylinder 68 forces the hydraulic piston and piston rod76 to extend and pivotally brings the wedge-shaped edge 64 of shearblade 58 together with the blade-receiving portion 66 of anvil member56. A tree positioned between blade edge 64 and blade-receiving portion66 as positioned in FIG. 3 when cut falls to the right of FIG. 3 and asshown in phantom outline.

As previously discussed, a rotatable drive connects the cutting portion54 of the tree shear device with the shear frame 46. The rotatable driveis enlarged in FIGS. 4 and 5 and generally designated as 86. Therotatable drive 86 includes a shaft 88 which is arranged atsubstantially 90 to shear frame 46 and has a frontward extending endfixedly attached to the rear end of anvil member 56, a center portionjoumaled within a bearing 90 carried by the shear frame 46, and arearward extending end projecting through shear frame 46. A pinion gear92 is fixedly attached to the rearward extending end of shaft 88 by twobolts 95. Rotatable drive 86 also includes a rack gear 94 with teethwhich mesh with the teeth of pinion gear 92. Rack gear 94 ishorizontally disposed parallel to the transverse shear frame 46 butspaced therefrom in a rearward direction towards the tractor 32. Therearward extending end of the shaft 88 carrying the pinion gear 92, thepinion gear 92, and the rack 94 are encased within a rack and gearprotector box 96 which is grease filled. Cover plate 97 closes protectorbox 96. The horizontally arranged ends of rack gear 94 then extendleftward and rightward out of protector box 96 to attach to a lefthydraulic piston 98 and a right hydraulic piston 100. Left hydraulicpiston 98 is positioned for reciprocal motion within a left hydrauliccylinder 102 and right hydraulic piston is similarly positioned forreciprocal motion within a right hydraulic cylinder I04. Piston 98defines a left chamber 106 within hydraulic cylinder 102, leftward ofpiston 98, and piston 100 similarly defines a right chamber 110 withincylinder I04, rightward of piston 100. The ends of cylinders 102 and 104opposite protector box 96 are fixedly attached to a pair of bifurcatedears 114 and 116, respectively and positioned near the left and rightextremities, respectively, of shear frame 46.

The connection between lever member 48 and transverse shear frame 46 maybe more clearly seen in the enlarged view JIM of FIGS. 4 and 5. Inparticular, forked extensions 118 are welded to the rear side oftransverse shear frame 46 towards tractor 32. A pair of shafts 120extend parallel to shear frame 46 between the tines of each extension118 and one end of a lever member 48 is joumaled upon each shaft 120 topivotally connect lever member 48 with shear frame 46. The other end ofthe lever members 48 are similarly pivoted to shear frame hangers 44 bymeans of the shafts 121. The ears 53 pivotally connecting one end ofshear tilt cylinder 52 are also shown in FIGS. 4 and 5.

FIG. 6 shows a schematic representation of the hydraulic systemoperating the tree shear device of the present invention. Specifically,hydraulic fluid reservoir 42 is shown connected to a pair of fluid pumps122 and 124. Fluid pump 122 provides fluid to the control valvesgenerally designated as 40. In particular, double-acting control valve126 provides fluid to and accepts fluid from single acting hydrauliccylinders 102 and 104; double-acting control valve 132 provides fluid toand accepts fluid from double-acting hydraulic cylinders 52;double-acting control valve 138 provides fluid to and accepts fluid fromdouble-acting hydraulic cylinders 50; and double-acting control valve144 provides fluid to and accepts fluid from double-acting hydrauliccylinder 68.

OPERATION In operating the preferred embodiment of the tree shear deviceof the present invention illustrated, an operator first decides in whichdirection the tree to be out should fall and approaches the tree along aline which is from the desired final position off the tree on theground. The operator next arranges the cutting means 54 such that anvil56 is directly towards the desired final position of the tree on theground, i.e. the anvil 56 is closer to the side to which the tree isdesired to fall than is the blade 58. The blade 58 is caused to pivotaway from the anvil 56 to admit the tree between the edge 64 of theblade 58 and the blade-receiving portion 66 of anvil 56, such as isshown with respect to tree 84. The operator then ac tivates hydraulicmeans 67 to cause blade 58 to pivot upon shaft 60 mounted on anvil 56and shear the tree 84.

Specifically. assume the tree cutter 54 is in the position indicated bythe phantom line representation of cutter 54 of FIG. I and assume theoperator desires the tree to fall to his left, towards the top ofFIG. 1. Since the angularly disposed edge 64 of blade 58 is designed tocause the tree 84 to fall towards anvil member 56, cutter 54 is l80 outof position to cause the tree to fall to the operators left, and thecutter 54 must be rotated 180. To rotate cutter 54, the operatoractuates control valve 126 of FIG. 6 to cause fluid to flow from fluidreservoir 42, through pump 122, through tube 125, through control valve126, through tube 130 and to hydraulic cylinder 102. The fluid fillschamber 106 within hydraulic cylinder 102 and causes the rightwardtransverse movement of the piston 98, the rightward transverse movementof rack 94, the clockwise movement of pinion 92 as seen in FIG. 5. Therightward transverse movement of rack 94 also causes the rightwardtransverse movement of piston within hydraulic cylinder 104 which causesthe emptying of chamber within hydraulic cylinder 104. The fluid flowingfrom chamber 110 flows through tube 128, through control valve 126 andback to fluid reservoir 42 through tube 139 to complete the fluidcircuit. The resulting clockwise rotation of pinion 92 causes the anvilmember 56 to rotate under blade 58 from the phantom position shown inFIG. I to the solid line position shown in FIG. I. When the desiredangular position has been reached, the operator stops the rotation bystopping the fluid flow through control valve 126.

After the operator rotates the cutter 54 to the desired angularposition, he can adjust the vertical position of cutter 54 to shear thetree at any desired height, between the ground and the maximum verticalposition of cutter 54 shown in FIG. 2, as follows. Assume the operatorwishes to move the cutter 54 from the solid line position shown in FIG.2 to the phantom line position nearer the ground. Actuation of controlvalve 138 by the operator causes fluid to flow from hydraulic fluidreservoir 41,2, through pump 1122, through tube 125, through controlvalve 138, through tube 140 and to the chamber within shear lifthydraulic cylinders which cause the piston rods associated withcylinders 50 to further extend. This further extension of the pistonrods from cylinders 50 causes the angle between lever member s8 andshear frame hanger 44, best seen in FIG. 2, to increase beyond 90.Simultanecurly, the operator activates control valve 1132 to cause fluidto flow from hydraulic fluid reservoir 42, through pump 1122, throughtube 1125, through control valve 1132, through tubes 136, and to thechamber within shear tilt cylinders 52 which causes the piston rodsassociated with cylinders 52 to retract into cylinders 52. Thisretraction of the piston rods into cylinders 52 decreases the anglebetween lever member db and cutter d below the 180 straight angle, shownin solid line in FIG. 2, towards the angle shown in the phantomposition. Thus, the shear lift cylinders 50 raise and lower the shearframe 46 with respect to the tractor frame 36, and the shear tiltcylinders 52 control the tilt of the cutter 5a to properly align it.

After the desired position is reached, the operator releases controlvalves 1126, 1132, 1138 and activates control valve 114% to pivot blade58 away from blade-receiving portion 66 of anvil member 56 in order toreceive the tree to be cut. When there is sufficient space between blade58 and the concave receiving portion 66 of anvil member 56 to receivethe tree, the operator drives the vehicle forward to position the treebetween the blade edge 641 of blade 58 and the blade-receiving portion66 of anvil member 56 as in FIG. 3. By actuating control valve 11% andcausing fluid to flow from fluid reservoir 412, through pump 1124,through tube M5, through tube M6, through control valve 144, and intohydraulic cylinder 6%, piston rods 76 is caused to further extend fromthe double-acting hydraulic cylinder 68, the blade 58 may be forcedthrough the tree to be cut, and the tree caused to fall toward anvilmember 56. By reversing the direction of hydraulic fluid flow such thatfluid flows from hydraulic cylinder 68, through tube 148, throughcontrol valve 144, and to fluid reservoir 412, through the tube M9,blade 58 may be retracted from the blade-receiving portion 66.

Now that the basic teachings of the present invention have beenexplained, many extensions and variations will be obvious to one havingordinary skill in the art. For example, adjustment of cutter M has beenexplained such as to position it in a purely horizontal plane. This isnot necessary, and cutter 541 may be positioned to accommodate a hillyor bumpy terrain in accordance with the explanation given. That is, therotation of cutter 54 may leave it with an angle to the horizontal, andlikewise the shear tilt cylinder 52, may be adjusted to allow an upwardor downward slant to cutter 54L lclaim:

l. A tree shear device adapted to attach to the frame of a vehicle androtatable to an angle of at least 180 to cause the tree to be cut tofall in a predetermined direction with respect to the tree shear, thedirection of fall being changeable by rotation of the shear through the180 angle, the shear comprising:

a. a shear frame;

b. an anvil member;

c. a shear blade having a wedge-shaped shearing edge, the shear bladepivotally mounted on and carried by said anvil member, the combinationof said shear blade and said anvil member forming a tree-cutting means,with the wedge-shaped shearing edge of said shear blade together withsaid anvil directing the fall of the tree to be cut away from said shearblade;

d. controlled rotatable drive means including means for actuating saiddrive means mounted on said shear frame and connected to thetree-cutting means for supporting the treecutting means and for rotatingthe tree-cutting means at least through an angle of 180 when actuated;and

e. means connected between said shear blade and said anvil member forcausing said blade to pivot relative to said anvil to cut a treepositioned therebetween, said wedgeshaped shearing edge of said bladecausing the tree to fall in a predetennined direction with respect tothe treecutting means, the direction of fall being changeable leftwardor rightward of the vehicle by rotation of the treecutting means throughan angle of substantially 2. The tree shear of claim )1, in which thecontrolled rotatable drive means includes a shaft journaled in the shearframe and connected to the tree-cutting means.

3. The tree shear of claim 2, in which the controlled rotatable drivemeans further includes:

a. rack means arranged to move transversely;

b. pinion means fixedly mounted on said shaft and arranged such that theteeth of said pinion means engage the teeth of said raclt means; and

c. means for traversely moving said raclt means when actuated, thetransverse movement of said raclt means causing rotary movement of saidshaft means through said pinion means for rotating the tree-cuttingmeans.

t. The tree shear of claim 3, in which the means for transversely movingsaid raclt means comprises:

a. a hydraulic fluid reservoir;

b. a fluid pump fluidically connected to said reservoir and;

c. a pair of hydraulic fluid cylinders, fluidically connected to saidpump and disposed at opposite ends of the rack means and including apair of pistons, one piston connected to the first end of the rack meansand the other piston connected to the second end of the rack meanswhereby actuation of a flow of hydraulic fluid from said reservoir,through said pump and to one of said hydraulic cylinders causestranslational movement of the piston within said one cylinder andthereby causes translational movement of the rack means.

5. The tree shear of claim 4i, in which said pivoting means for saidblade comprises:

a. a hydraulic cylinder having an end connected to said anvil member;

b. a hydraulic piston reciprocally arranged within said hydrauliccylinder; and

c. a piston rod having one end connected with the hydraulic piston andhaving the other end connected with said shear blade.

6. The tree shear of claim 5, also including means attached to saidshear frame and adapted to attach to the vehicle frame for raising andlowering said shear frame relative to the vehicle frame for causing theraising and lowering of the treecutting means.

7. The tree shear of claim 6, in which said means for raising andlowering said shear frame includes hydraulic means.

d. The tree shear of claim 7, in which said means for raising andlowering said shear frame includes lever means pivotally attached tosaid shear frame and adapted to pivotally attach to the vehicle frame.

9. The tree shear of claim 8, in which said hydraulic means comprises:

a. first hydraulic means pivotally attached to said lever means andadapted to attach to the vehicle frame for lifting said shear frame; and

b. second hydraulic means pivotally attached to said lever means andsaid shear frame for tilting said shear frame.

110. The tree shear of claim 1, in which said pivoting means of saidblade comprises:

a. a hydraulic cylinder having an end connected to said anvil member;

b. a hydraulic piston reciprocally arranged within said hydrauliccylinder; and

c. a piston rod having one end connected with the hydraulic piston andhaving the other end connected withsaid shear blade.

1111. The tree shear of claim 11, also including means attached to saidshear frame and adapted to attach to the vehicle frame

1. A tree shear device adapted to attach to the frame of a vehicle androtatable to an angle of at least 180* to cause the tree to be cut tofall in a predetermined direction with respect to the tree shear, thedirection of fall being changeable by rotation of the shear through the180* angle, the shear comprising: a. a shear frame; b. an anvil member;c. a shear blade having a wedge-shaped shearing edge, the shear bladepivotally mounted on and carried by said anvil member, the combinationof said shear blade and said anvil member forming a tree-cutting means,with the wedge-shaped shearing edge of said shear blade together withsaid anvil directing the fall of the tree to be cut away from said shearblade; d. controlled rotatable drive means including means for actuatingsaid drive means mounted on said shear frame and connected to thetree-cutting means for supporting the treecutting means and for rotatingthe tree-cutting means at least through an angle of 180* when actuated;and e. means connected between said shear blade and said anvil memberfor causing said blade to pivot relative to said anvil to cut a treepositioned therebetween, said wedge-shaped shearing edge of said bladecausing the tree to fall in a predetermined direction with respect tothe tree-cutting means, the direction of fall being changeable leftwardor rightward of the vehicle by rotation of the tree-cutting meansthrough an angle of substantially 180*.
 2. The tree shear of claim 1, inwhich the controlled rotatable drive means includes a shaft journaled inthe shear frame and connected to the tree-cutting means.
 3. The treeshear of claim 2, in which the controlled rotatable drive means furtherincludes: a. rack means arranged to move transversely; b. pinion meansfixedly mounted on said shaft and arranged such that the teeth of saidpinion means engage the teeth of said rack means; and c. means fortraversely moving said rack means when actuated, the transverse movementof said rack means causing rotary movement of said shaft means throughsaid pinion means for rotating the tree-cutting means.
 4. The tree shearof claim 3, in which the means for transversely moving said rack meanscomprises: a. a hydraulic fluid reservoir; b. a fluid pump fluidicallyconnected to said reservoir and; c. a pair of hydraulic fluid cylinders,fluidically connected to said pump and disposed at opposite ends of therack means and including a pair of pistons, one piston connected to thefirst end of the rack means and the other piston connected to the secondend of the rack means whereby actuation of a flow of hydraulic fluidfrom said reservoir, through said pump and to one of said hydrauliccylinders causes translational movement of the piston within said onecylinder and thereby causes translational movement of the rack means. 5.The tree shear of claim 4, in which said pivoting means for said bladecomprises: a. a hydraulic cylinder having an end connected to said anvilmember; b. a hydraulic piston reciprocally arranged within saidhydraulic cylinder; and c. a piston rod having one end connected withthe hydraulic piston and having the other end connected with said shearblade.
 6. The tree shear of claim 5, also including means attached tosaid shear frame and adapted to attach to the vehicle frame for raisingand lowering said shear frame relative to the vehicle frame for causingthe raising and lowering of the tree-cutting means.
 7. The tree shear ofclaim 6, in which said means for raising and lowering said shear frameincludes hydraulic means.
 8. The tree shear of claim 7, in which saidmeans for raising and lowering said shear frame includes lever meanspivotally attached to said shear frame and adapted to pivotally attachto the vehicle frame.
 9. The tree shear of claim 8, in which saidhydraulic means comprises: a. first hydraulic means pivotally attachedto said lever means and adapted to attach to the vehicle frame forlifting said shear frame; and b. second hydraulic means pivotallyattached to said lever means and said shear frame for tilting said shearframe.
 10. The tree shear of claim 1, in which said pivoting means ofsaid blade comprises: a. a hydraulic cylinder having an end connected tosaid anvil member; b. a hydraulic piston reciprocally arranged withinsaid hydraulic cylinder; and c. a piston rod having one end connectedwith the hydraulic piston and having the other end connected with saidshear blade.
 11. The tree shear of claim 1, also including meansattached to said shear frame and adapted to attach to the vehicle framefor raising and lowering said shear frame relative to the vehicle framefor causing the raising and lowering of the tree-cutting means.